Mechanism for applying brake linings



Oct. 2, 1951 J. l. sPANlcH 2,569,737

MECHANISM FOR APPLYING BRAKE LININGS Filed Dec. 10, 1949 BY E' 1-E. M

/77' rai/V575,

Patented Oct. 2, 1951 MECHANISM FOR APPLYING BRAKE LININGS John I. Spanich, Plymouth, Mich.

Application December 10, 1949, Serial No. 132,247 i In Canada October25, 1948 (or. 15A-.1)

24 Claims.

This invention relates generally to mechanisms for cementing elements under `the influence of pressure and -heat and` is particularly adapted, among' `other uses, forY the cementing of brake linings to brake shoes. This application is a continuation-in-part of my copending application. Serial No. 768,178 filed August l2, 1947 for Mechanism for Applying Brake Linings now abandoned.

Objects of this invention are to provide a simple, economical, and easily manufactured mechanism of the type described; to provide such a mechanism which is simple and trouble-free in its operation; to provide such a mechanism which may be readily altered to accommodate various sizes of brake shoes, toprovide such a mechanism which will maintain a desired clamping pressure during the curing ofthe adhesive, and to generally improve mechanisms of the type described. i

Other and more specific objects of the invention will become apparent from the following specification, the drawings relating thereto, and from the claims hereinafter set forth.

In the drawings in which like numerals are yused throughout the various views to designate like parts; i

`Figure 1 is a view in side elevation of a mechanism for applying brake linings embodying the invention;

Fig. 2 is a view taken substantially along the line 2-2 of Fig. 1 and looking in the direction of the arrows; y

Fig. 3 is a view taken substantially along the line 3-3 of Fig. 1 and lookingin the direction of the arrows; Y

Fig. 4 is a view taken substantially along the line 4-4 of-Fig. 2;

Fig. 5 is a view of an adapter member for use with the mechanism whereby it is adaptedfor brake shoes of a different diameter; and

Fig. 6 is a view taken substantially along the line 6--6 of Fig. 2. 4

Although the present invention is specifically illustrated as being applicable to cement brake linings to brake shoes, as for example in carrying out a commercial cementing process known bythe trade name Cycleweld and although only a single specic embodiment of the invention is set forth, it will be appreciated by those skilled in the art that in its generic aspects it has other uses and various modications may be made in the structure within the scope of the present invention. The drawings are therefore to be taken as illustrative rather than as limitative, and the scope of the invention is to be limited only by the hereinafter appended claims.

Referring to the drawings, the numeral I indicates generally a brake lining-applying mechanism having a substantially rectangular platelike base member 2 to which has been welded, in` each of its four corners, feet 4 having apertures therethrough for receiving, if desired, bolts or lag screws 6 for suitably securing the mechanism I to any xed support. A pair of hollow substantially semicylindrical housing members or shoes 8 and I0 forming one jaw member of a clamp `having end walls I2 and I4 respectively are arranged with their open walls I6 and I8 slightly spaced apart and facing one another with their diametrically extending walls 20 and 22` abutting against a flat platelike member 24 seating against the upper surface of the base member 2. Flanges or bosses 26 and 28 extend inwardly from the walls I2 and I4 toward the Walls I6 and I8 respectively. These flanges 26 and 28 have spaced internally threaded apertures 30 for receiving cap screws 32 which extend upwardly through aligned apertures in the: members 2 and 24 and hold the semicylindrical members 8 and I0 in xed position with respect to the plates 2 and 24.

The outer radius of the shoes or anvils 8 and I0 is preferably equal to the radius of the under surface of the flange 34 of the smallest brake shoe 36 which the mechanism is designed to accommodate. A removable pin 40 received Within a radially extending aperture of the rearward shoe I0 locates one end of the shoe 36 whereby it is positioned substantially centrally of the peripheralsurface of the members 8 and I0. Preferably this pin 40 extends outwardly of the surface `slightly more than the thickness of the brake-shoe flange 34 to locate one end of the brake lining material 4I.

`Strip heaters 42 having terminals 44 and 46 are initially formed to substantially the same contours as the contours of the inner surfaces of the shoes 8 and Ii) in which the heaters are housed and have a length just sufficient so that when they are positioned in place within the shoes and Ii) and the shoes 8 and I0 are held by the cap screws 32 against the member 24, the ends of the heater strips 42 abut the top surface of the member 24 and are securely held to the members 8 and I0. The wall I4 has an aperture 48 extending therethrough through which the lead wires 50, 52, 54 and 56 extend. The lead wires 5|] and 52 are connected to the terminals 44 and 46 of the heater 42 associated with the shoe I0, while lead wires 54 andV 56 are connected to the terminals of the heater 42 associated with the shoe 8. Y

Located rearwardly of the shoes 8 and I0 and the platelike member 24 upon which they rest are a pair of spaced perpendicularlyV extending platemembers 58 and 60. The lower end of these members arelwelded toY rectangular steel blocks 52 andrespectivelyf- The rblocks 62 and 54 are held by suitable means such -as cap screws 65 to the top surface of the platelikeh member 2. The upper ends of the plate-members 58 and 60 extend diagonally withlres'pe'ct to the top surface of the platelike member 2. A connecting platelike member '|0 secured Ytothis top surface as by screws 68 forms-a topl support v i,

for the members 58 and 60.

A clamping mechanism is carried bythe y member i and comprises a pair of I i-shaped-'-' members 'l2 and 14, each having an angle face suit-ably..V securedl tot` the top: surface.` of4 .the .-mem'- ber l0 as by screwsl andi `each. having'.` another angle face or. flange '18a-nd: 80 zextendingfout- Y wardly of the member 1.0; in spaced lrelationto.

each other. Aclamping lever 82 isfulcrumed at oneendportioncnza .pin 84 whichv extends between thev flanges '|'|1..and.8||. .The other end. of. .thegclampng .lever.82'.is..secured as by. a pin 85. within. a.` bifurcated` endl portion of a connect-v ing member 88. wThemember. 88 is provided with an internallythreaded. aperture forreceiving the upper .end of an adjusting. screw 90. having. its.

lower endV portion: screwethreadedly received within Va second connecting..member 921which receives. within its..downwardly.extending bifurcatedv end portion a. downwardly facing yoke member 94.. A4 handle: member ||2 isbifurcatedv at, its lower end and .the bifurcated lower end portion straddles the. clamping. lever .82 intermediateits end .portions and ispivoted thereon as by means of. -a pivot pin4 H4. Forward movement of the handle. |.|2 (counterclockwise) is portions: of theY handle ||2. as by a pin |22.

The yokemeznberlv has an. internal radius.

which is substantially greater than4 the external radius ofY the; shoes 8 'and |0 andV of the brake shoes 35 which may bey carried thereby. Each. end of the yoke member;.9,4\-carries a pad 96 which has a lower surface98 extending substantially parallel to thetop surface ofthe platelike. member 24. The adjacent ends of the surfaces 98 terminate inV downwardly Yextending, substantially semicylindrical surfaces |00. A flexible, somewhat resilient stainless steel strip member |02 is clamped atl either end to the surfaces |00 by clamping blocks |04 suitably held to the blocks 90 by means of capscrews |06 and forming a second jaw member of the clamp. In order to provide a substantially constant force acting on the brake lining material 4| Vto hold it to the brake shoe 36 the yoke 94 is provided withv resilient members |08a which have platelike portions |0813 clampedy between the pads 96 and the adjacent portions of strip member |02. The members |080l have substantially semicylindrical portions` |080 which are, normally` posi- 4 tioned outwardly of the portion |00. The member |02 extends over the semicylindrical portions |08c and extends in a substantially semicylindrical form |08 downwardly from the internal diameter of the yoke 94. When the mechanism 'H is in clamping position, the strip member |02 securely clamps a strip of brake lining material 4| to the upper surface ofthe flange v34 of theV brake shoe 35 which is held bythe semicylindrical members 8 and l0. A pair of L-shaped locators |09 (one only of which is shown) are welded to the top surface of the strip member |02.V at either side of .the vertical centerline of the shoes 8. ang-le. portion thereof extends toward but does The downwardly extending rightnot engage the peripheral surface of the shoe 8 whereby .the forward edge of the strip member |02 is aligned with the forward edge of the brake-shoe ange 34 and lining material 4|.

The actual pressure exerted to hold the lining material. 4| againstathe brake shoe SSLmaybe controlled. by the adjustment 'of the :UL-shapedAV members 88 and .92: along the connecting. rodforscrew 90. and'..which may..\be.held in..adjusted positionby means ofY lock nuts |0.... With theclamping mechanism 1 4| securely against the upper surfacaf'of. the. brake-shoenange 34. With the.=.yoke..94 thusly clamped, the portions |080, willpfbe. flexed some-r what toward-the portionsl 0.0.I andexert a downs ward force onthe strip member: |02 for-applying .a clamping force ,t0 hold: the brake; liningcmateV rialV 4| againstV the' brake ,shoe` 36,5 Torrelease.z

the clamping mechanismy '|I1', the; handle-H2 is4 rotated clockwise (see'fllig.l 1') sov that' theiipin |22 will pass to the. rightof the: linei of' centers of the pins |20, 4 afterfwhich continued clockwise rotation of the handle ||2 will tend1to. rotate the lever 82v in a clockwise, directionthere by lifting the yoke-94 upwardly .and rearwardly..

Subsequent to releasing the yoke; 94 fromv its.

clamping rela-tion, it may-alsoz'be,v rotated about. the pivot pin86iwhereby the-yoke 9 4. is movedY away out of position'rto allow-clearV access; to insert and remove the brake shoes and the; brake lining` to and from-theY semicylindrical.members 8 and |0.

Since the cementing material which is applied.

between theA brakehliningmaterial 4|.'and the brake-shoe flangeV 34 is usually4V thermosetting..

heat must be applied so that the temperature. is raised sufliciently` to, permit the -cementingj material to tightly bend the-brake-lining material-4| to the brake-shoe flange 34. This'heat is. pro-- vided by' means of the-above-mentioned heaters 42 which underlie the semicircularilmembers. 8 and I0 and-are held tightly'theretofbecausezof the engagement of*V their end'- portions; with the topV surface of the platelike member24. TemperatureA of theshoes 8 and-i0? is controlled by-x a-fthermostat |30 carried adjacent one rear; 'cornerof the' platelike member v2 by means of an=angle bracket |32 held as by screws |313.; tubev |34 ofthe thermostat I 30 extends. along 'the' clips |38. Thethermostat 4|3.lf.is suitablyicon-v nected in electrical-f circuit Vwith the .heaters 42-` in any well-known manneriwherebyv electricalenlI in zthepsr. tion as showninFig. 1, yoke 94 is held inclampf ing 1 position tohold the.` brake-lining l material'.

A. capillary-i` control.

assurait.;

temperature of the shoes 8 and I0 within desired temperature limits.

Since the radius of all brake shoes `36 is not constantand it is desired to use the brake liningapplying mechanism for brake shoes of various sizes, a series f hollow semicylindrical members such as illustrated by reference character |40 in Fig. are provided. The internal diameter of all of the various shoes, similar to those illustrated in Fig. 5, is the same as the external diameter of the members 8 and I0, ywhile the external diameters of theladapter members |48are made to agree with the internal diameters of the flanges 34 of the brake shoes 36 which are to have linings applied thereto. Whenit is desired to change the size of the brake shoe, the pin 40 is withdrawns the desired oneof the adapter members |48` is selected and placed around the outside of the members 8 and I8 and the pin`48 then reinserted in an aperture |42 in the adapted ring which is provided for this purpose. When various adapters |48 are used, yokes 94 and resilient member |02 of -corresponding size but of the same construction as shown may be and preferably are:

used.

The vertically `extending platelike members 58 and 68 are provided with a series of internally screw-threaded apertures |58, 52 and |54, three being sho-wn since the illustrated machine has been designed to operate for three different sizes of brake shoes, but which of course could be of any number. A pair of locating pins |56 and |51 each have a plurality of holes extending therethrough, three holes being shown in the present instance, since the present machine is designed to operate with three different widths of anges 34 of brake shoes 36. Wing nut screws |58 eX- tend through the proper one of the apertures of the pins |56 and |51 and thread into the proper one of the internally screw-threaded apertures |58, |52 and |54 so that the outwardly extending,

end portion of the member |56 will lie on the peripheral surface of the shoe I0 on the adapter I 48 associated therewith and engage the rearward edge of the brake-shoe ilange 34 for locating the brake shoe 36 on the members 8 and I8 or of the adapter member |40 as the case may be.

It is believed that the remainder of the details of construction may be best understood by a reference to the operation of the mechanism which is as follows:

The power-supply cable |18 is attached to a convenient source of electrical energy. Electrical current flows under control of the thermostat |30 through the heaters 42 whereby the members 8 and l0 are heated to the desired temperature. When the desired `temperature is reached, the thermostat |30 will discontinue llow of electrical energy to the heaters 42 until such time as the temperatures of the members 8 and 0- justments of the members 88 and 82 and the rod 88 are made and the lock nuts ||0 lock them in this position, the handle ||2 is moved to its extreme clockwise position, and the brake shoe 36 which is to have the lining applied is placedon theshoes `8 and I0 or adapters |48. asthecis.`

may be,with its rib or .web 3 8 extending down-l` 'wardly between the surfaces I 6 and llwith its right-hand end in engagement with the locating pin 48 `and itsrear edge abutting the pins I 56 and |51 `which have beenproperly positioned by the,

1| brings the locators |89 against the forwardV edge of the brake-shoe flange 34 and liningma-A terial 4| and the ilexible strip |82 against the top surface of the brake-lining material 4|. The material 4| is thereby aligned on the brake shoe 36 and securely clamped to the upper surface of the flange 34. By the use of the exible member |02 for directly engaging the brake-lining material 4|, any irregularity in the thickness of the brake lining or the contour of the flange 34 will be compensated. As stated above, upon clamping of the mechanism 'Il the members |88 will be flexed toward the portions |88 and transmit the force to the strip member |82 for clamping the material 4| to the shoe 36. During the thermosetting of the cement, it may contract to a slight extent. Such a contraction without members |08a might tend to decrease the clamping pressure on the material 4| although such an arrangement has been used with satisfactory results. The provision of the members |08a are however, preferable and will provide for a more constant clamping force since any contraction of the cement will be compensated lfor by a slight flexing of the members |08a. Test results show no measurable amount of decrease of clamping pressure with the members llltct. When the handle ||2 is moved to its extreme counter-clockwise position against the stop pin I6, the pivot pin |22 will be forward of the line of centers through the pins ||4 and |20, and the mechanism will stay in its locked clamped position. After the desired time has elapsed for the cementing of the brake-lining material 4| to the brake shoe 36, the handle ||2 is moved in a clockwise direction whereby the yoke 94 is lifted away from the brake shoe 36 so that it may then be removed for use or storage.

It will be obvious that changes in temperature may be made by the adjusting knob |12 of the thermostat |30, that the mechanism may be` adapted for use in applying brake lining materials to brake shoes having various diameters by the use of the proper adapter ring 48, that brake linings' may be applied to brake shoes having various web widths by the proper positioning of the members and |58, and that the locator |09 will position the brake -lining material in aligned position on the brake-shoe web 34.

What is claimed and is desired to be secured .by United States Letters Patent is as follows:

l, In a mechanism of the character described, a base member, a heater element, a housing for said element having an outwardly facing surface corresponding in contour to the surface of a rst element to be placed thereover, a rigid downwardly opening arcuate yoke, a flexible member adapted to engage and conform to the adjacent contour of a second element which is to be cemented to the first element, said flexible member being secured tothe opposite end portions of said yoke, and a spring member operatively connected to `exert a force between saidyoke and said exatenerse* ible memberf `forv` controlling the `force imparted tosaidflexible1member by said yoke, and mechanism exerting a react-ive force on said basement ber for applying a force to said yoke -whereby said' fl'exible'- member is operable to clamp the-elements togetherV and to said housing.

2.v Ina mechanism ofthe character' described,l

abase member, a heater element, a housing for said element having an outwardly facing surface corresponding in contour tothesurface of a firstI element to be placed-thereoven a yoke, a flexible" member VadaptedY to'engage a second element which 'is to be cemented to the first element,-

means for-securing said flexible member at'spaced points to said yoke, resilient means carried by said f yoke at' said spaced points and vengageable with saidfiexible member at points intermediatethei securement ofsaid flexible member'to said yoke,

mechanismV exerting areactive forcer onV said baseA over said members with its flange portion received in the space between said hollow members,V elec-V tricalheater elements positioned within said hollow members and Vheld in intimate connecting relation therewith, a yoke, a flexible strip member carriedV at spaced portions by said yoke and adapted' to beV positioned against a brake lining for holding the same against the brake'shoe,Y resilientmeans carried by saidyoke at said spaced points and engageable with said exible member points to said yoke, said means includinga resilient element extending betweensaid yoke and said flexible member and providing a lost motion connection to permit limited relative move-y mentfbetween said flexible member'and said yoke, and mechanism exerting a reactive -forcefori said base member for applying a force to saidyoke whereby said iexiblemember is operableitociampA the elements together and-to said housing.

6. An article of manufacture comprising al rigid f member having spaced attaching portions, a flexibleV member extending` between said spaced por tionsand 'secured thereto, and resilient members' secured to said spaced portions and having force applyingportions spaced from said rigid member and engaging said flexible-member. Y

7.The combination of claim 6? in which said rigid member has a concave surface intermediate said spaced attaching portions.

. `8.1 The; combination'. of fclaim. 7 in' which' Said'.

resilient members force applyingfportionsareprovided with convex surfaces which engagelsaidJ exible member.-

9; In a mechanism for cementing brakev linings i tobrake shoes, a base member, apairlof substan`:

' tially' 'semicylindrical rhollow memberscarried-by said basefmember in` adjacent but spaced relation" to eachother whereby albrake shoemay be placedn over saidmembers with its rib portion received in the spacebetween said.v hollow members, electrical Y heater elements positioned within said hollow members andi held in intimate contacting relation.

therewith, a rigidyoke, a flexible strip member carried at. vspaced portions bysaid yoke and adapted to Vbe positionedagainst a brake lining for holding the sameagainst the brakeshoe, and-y means carried ibyA said base member for holdingr said yoke in position to clamp. said -exible' member against said lining. V

10'.; An electrically heated fixture for bonding.

a `friction lining .to theY convex surface of theY flange of a brake shoe having a web or rib por-y tion-comprising, a base, an anvil member car-4 ried by said base vand having. a convex surface with a circumferential recess therein adapted to receive-thev weby or rib,- portion whereby suchshoe flange may intimately engage said convex surface, 1an electrical heating element carried by said anvil member on the opposite side of said surface' from such'brake shoe `iiange whereby said surface preventsv direct radiationfromsaid element. to such flange, a rigid yoke having spaced relatively fixed 'extending portions, said yoke being movableiinto straddle relation with such shoe .whereby said spaced portions extend beyond the ends of such lining, a laterally flexible stripk carried at its. opposite end portions by be bodily moved out of overlying relation with said anvil.

12;'An electrically heated fixture for bonding a friction lining. to the convex surface of the flange of a brake shoe having a web or rib'portion comprising, a base, Yan anvil member carried -by said base and having 1a' convex surface withl a circumferential recess therein adapted-to receive the web or rib portion whereby suchY shoe Y flangev may intimately engage said'convex sur'- face, an electrical heating velement carried by said anviimember andpositioned on the opposite side of said surface from such brake shoe' flange for heating the flange, a postlike structure car'- riedv by said,l base and extending upwardly adjacent one lateralfedge of said anvil, a rigid yoke having relatively xed spaced extending portionsY movable into straddle relation with and adapled` tudinal edge: of said anvil whereby said yoke may lascars? flange of a brakeshoe having a web "or ribpo'rtion comprising, abase, an anvil member carried" by said base and having an upwardly'facing convex surface with a circumferential `recess therein adapted to receive the web Vor rib portion whereby such -shoe flange mayintimately engage said convex surface, an electrical hea-ing element positioned entirely within said anvil member for heating the nange, a postlike structure carried by said base and extending upwardly adjacent one lateral edge of said anvil, a rigid yoke having relatively' iixed'spacedV downwardly extending portions arrangedin straddle relation with and adapted to extend beyond the ends of said lining, a flexible strip carriedsolely at its opposite end portions by said yoke portions and adapted to engage the outwardly facing surface of such lining, and clamping means `carried by said pcstlike structure and having its axis of movement transverse to-said anvil, means securing a cen.ralsection of said yoke to saidfclamping means whereby said strip may be clamped against the lining and removed therefrom in a direction transversely to said anvil for insertion and removal of brake shoes, and locating means carried by said postlike structure and projecting toward and overlying said anvil and engageable by such flange, said locating means adapted to exLend outwardly of said anvil a distance greater than the thickness of such `fiange whereby such lining is engageable therewith for locating such lining relative to such flange.

14. An electrically heated lixture for bonding a friction lining to the convex surface of the flange of a brake shoe having a web or rib portion comprising, a base, a pair of semi-cylindrical member carried by said base to provide a pair of upwardly facing convex surfaces, said members being slightly spaced to provide a circumferential recess therebetween adapted to receive the web or rib portion whereby such shoe flange may intimately engage said convex surfaces, end walls closing the outer end surfaces of said members to provide a hollow closed housing except for said recess, an electrical heating element carried within said members and for heating said surfaces, a postlike structure carried by said base and extending upwardly adjacent one lateral edge of one of said members, a rigid yoke having relatively fixed spaced downwardly extending portions arranged in straddle relation wi.h and extending beyond the ends of such lining, a flexible strip carried at its opposite end portions by said yoke portions and adapted to engage the outwardly facing surface of such lining, and clamping means carried by said postlike structure and having its axis of movement transverse to said anvil, and means securing a central section of said yoke to said clamping means whereby said strip may be clamped against such lining and removed therefrom in a direction transversely to said anvil for insertion and removal of such brake shoes.

15. An article of manufacture comprising an arc-shaped rigid member having a concave face and a convex face, and a pad portion carried at each end portion thereof, said member having an outwardly facing boss on each said pad portion adjacent said concave face, a pair of leaf springs having a deformed portion providing an outwardly facing convex surface portion and having an end portion, Asaid end portions being individually positioned against said pad portions with said boss extending into said deformed portion, said deformed portions normally being 10 spaced away `from saidbosses, a llexible'member having a central section shaped to generally conform to said concave surface and having end portions extending around said spring convex surface portions and against said spring en d portions, and means for clamping said end portions to the respective said pad portions with which they are associated.

16. An article of manufacture comprising a rigid member having spaced attaching portions, a flexible member extending between said spaced portions and secured thereto, and a resilient member secured to one of said spaced portions and having a force applying portion spaced from said rigid member and engaging said flexible member.

17. In a device of the character described, an

` and away from said anvil for applying a clamping force to clamp a second element against such first element and against said anvil, one of said members including a rigid yoke having a pair of spaced force exerting portions immovable with respect to each other and serving to exert the entire clamping force to clamp such elements, and a lost motion force exerting means interposed between said relatively movable members to control the force exerted therebetween upon relative movement thereof.

18. The combination of claim 17 in which said lost motion means is a spring in which one portion of said spring abuts a rst of said relatively A movable members and another portion abuts a second of said relatively movable members.

19. In a device of the character described, an anvil having an outwardly facing surface for supporting a rst element, a plurality of movable force exerting members movable toward and away from said anvil for applying a clamping force to clamp a second element against such first element and against said anvil, a first of said members including a rigid yoke having a pair of spaced force exerting portions immovable relative to each other, a second of said members comprising a flexible band having spaced portions secured to said rst member portions, a third of said members being operatively connected to said first member, two of said plurality of force exerting members being relatively movable, and a resilient force exerting member interposed between said relatively movable :members to exert a force therebetween upon relative movement thereof.

20. The combination of claim 19 in which said two members comprise said rst and said second members.

21. In a mechanism of the character described, a base member, a first jaw member carried by said base member, a second jaw member cooperable with said rst jaw member to clamp a workpiece therebetween, a yoke member having spaced portions immovable with respect to each other and serving as the sole means for transmitting force to said second jaw member, said yoke member being operatively connected to said base member and effective to exert a reactive force thereagainst t0 provide a clamping force for clamping such workpiece, and a lost motion force exerting connection between two of said members through which at least a portion of said clamping force is exerted.

22. The combination of claim 21 in which said second jaw member comprises a flexible member '1 1 f secured-V at opposite end Yportions to said yoke *memberY portions. Y

23.. `TheY combination-of claim 21 in which said lost motion'eonnectioncomprises a spring interposed between said second Ajaw member and one of saidyoke member spaced portions.

24. In a deviceof the character described, an anvil having an outwardly facing surface Afor supporting a rst element; a clampmember movable toward andfaway from said surface of said anvil andfadapted to ,clamp a second element against sueh'rst element whereby such'elements Y Amaybe held together, -a force transmitting member movable relative `to said anvil having `spaced portions Vfixed .to .said "clamp vand intermediate portions movable relative top said clamp, means `Or'mOVingfsaidclamp Aand said force transmit- -tingmember to a-se1ected` position relative to said-anvil, and force exerting means having mounting portions movable with said clamp Vand pressure portions 'movable independently ofsaid aelamp andanvil, said pressure portionsbeing `positionedV to influence the position of said interf; mediateportions of said Vforce transmitting mem- -ber -upon=clamping movement of saidclamp in relation toy said anvil and' independently V4o1 imovementof said -clamp'relative to said anvil.

JOHN I. SPANICH.

REFERENCES CITED The'following references 'are' of record AJin the IileA of this patent: 1-

UNITED STATESPATENTSY 

